The chasm rifle is too weak, takes too many hits to kill even a quake grunt 

It is the same code as the normal gun.
Here is some comparisment with the usual Quake enemies.
They all start an infight.

v2.04 

The chasm monsters can infight with the Quake monsters, but they still don't fight each other.

In the Original Chasm, a faust will definitely fight a stratos 

when a Faust hits a enforcer, the enforcer will only follow the faust around, so there is still something wrong with the infight code. 

But I think the Faust attack speeds is now good.

But the Faust looks noticeably shorter then the enforcer, they should be the same 

Something slipped my attention, as the mong-faust and stratos only had a run stand and run pose. Reason why I couldn't attach a path_corner to them.

While correkting it Faust has now its original round look. Don't know why it kept hanging.
Infight is different, although enforcer and stratos stay black sheep when attacked. They won't refire.

So Faust fight Stratos who won't respond.
Mong fights Enforcer who won't respond.

Quake monsters are much more fixed on the player.
Mong almost needs a kick before it wakes up.

dev2.05 

haha, just make every monster attack each other, regardless of the fact that they are from Quake or Chasm 

The enforcer will infight with a stratos though, perhaps this can offer a clue? 

The grunt will also infight with a stratos, so maybe you should check the infight of Chasm flying monster vs chasm ground monster. 

But the Stratos stop kicking me again. So check the attack scenes 

Did you figure out the infight problem? Maybe you can check the source code of copper quake, that mod makes some changes to infight, maybe it can help you figure out the problem. 

The in fight is solved only Stratos stays a bit lame when attacked.
Added the Trooper, Leutenant and Mincer. 

A few things then:

Currently, gibbing a monster crashes Aguirre's engine at least, I think this has to do with the Head Gib, please add it.

Make the Mong fire shotgun instead of Laser, more powerful version of Grunt's

Make the Faust's rockets actually explode, and make them homing, the code for this is found in AD's rockeeter. 

I made some small additions.
- Added Leutenant, Captain and Mincer. Attack scenes may be a bit cluympy.
- Captains attack not finished, double flamemouth attack.
- Altered attack scenes Mong Faust and Stratos.
- Sometimes Faust or Mong won't reply to infight attacks.
- Added the h_head function to them.

The Mincer might be too strong with a lavaball.
And for homing rockets then there's no hiding.

dev2.06 

When I tested it, the stratos does not respond to infighting at all, so there are still problem with the infight code.

Why does Mincer have a fireball? It was like a Fiend without jumping.

Can you reinsert the grunts and the enforcer to check infighting.

I saw an alien warrior that do not respond to an alien captain's attack. 

The lavaball is useful for when you convert the Gross, because he throws rocks. 

Sorry, a small error on my part,

The alien warrior will infight with an alien captaim, but they both won't respond to an attack by the mincer. 

I didn't add the ladt monsters to the fight
Qc yet. So they don't in fight well.
Mincer is just a try out. 

Now I want to see a mincer and a fiend rip each other to pieces lol 

ahead. 

The mincer's corpse disappears.

The mincer only slashes me with its arms, it doesn't bite me. 

That's why it had a lava ball. Monsters start attacking immediately, so as soon it is in sight it uses its first attack. In this case it is bite, but as the distance is too wide it has no effect.
All corpses disappear after death. 

I am not talking about that, I understand the first bite has no effect, but when you are close to the mincer, the mincer is suppose to both bite and slash. Right now, it only slashes and never bites. 

I loaded up chasm in dosbox, and I just saw a mincer trying to bite me from too far away.

so this:
" In this case it is bite, but as the distance is too wide it has no effect."

is actually normal chasm behavior.

Please re enable the mincer's bite attack. 

"Monsters start attacking immediately, so as soon it is in sight it uses its first attack"

Fiends don't attack when they see the player, they start to run and only attacks if they are close enough. Mincer should do the same.